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20 × n is just double, then a 0: 20 × 7 = 140. And 19 is one less than 20 — so 19 × n = 20 × n − n, or 10 × n + 9 × n.
✓ You passed this lesson’s test.
Ten and a bit — “19 × n = 10 × n + 9 × n”
Use it for: Scores, money in ₹20 notes, and the round-and-adjust trick in Module 3.
Check: 19 × 7 = 20 × 7 − 7 = 140 − 7 = 133 ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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